IN PROGRESS - issue YAKHMI-567: Complete doc sections regarding java code generator

https://intern.itemis.de/jira/browse/YAKHMI-567

plugins/org.yakindu.sct.doc.user/help/developer/03_Concepts/concepts-toc.xml

@@ -1,4 +1,9 @@
 <?xml version='1.0' encoding='utf-8' ?>
 <toc topic="help/developer/03_Concepts/concepts.html" label="concepts">
-	<topic href="help/developer/03_Concepts/concepts.html" label="Developer Concepts"></topic>
+	<topic href="help/developer/03_Concepts/concepts.html" label="Developer Concepts">
+		<topic href="help/developer/03_Concepts/concepts.html#APIspecificationsofthegeneratedcode" label="API specifications of the generated code">
+			<topic href="help/developer/03_Concepts/concepts.html#SpecificationsofJavacode" label="Specifications of Java code"></topic>
+			<topic href="help/developer/03_Concepts/concepts.html#SpecificationsofCcode" label="Specifications of C code"></topic>
+		</topic>
+	</topic>
 </toc>